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Check the thermostat? It may be stuck closed.
If that is not it, it is probably your radiator is getting plugged. This would need to be removed and taken to a radiator shop to have boiled out.
Normal city driving presents no overheating
if you are certain that the head gaskets are good and the heads aren't cracked (they like to crack between valves) Id check the egr system...if it is blocked it can cause the engine run hotter (valve itself may be good but manifold passage may be full of carbon), as can retarded timing.(easy way to test is to just advance it a few degrees and see if temp changes) Have a hydrocarbon test done at the radiator...any combustion gasses present in there will tell you if head or gasket is leaking. If leak is small, it may only show up at higher rpms because it does not have time to escape.
Also...have you checked and verified that the gauge is accurate? Is it actually boiling over and pushing coolant out? If you have a 50/50 coolant mix, you should not be boiling at that temp. (with the right cap pressure) It is also important that the air flow is unobstructed...make sure that the a/c condenser is not plugged up with bugs or other debris. If it is, it's the same as putting cardboard in front of the radiator.
First you will need a chrome removal tool KD 2038 or similar. You slide it under the edge of the trim between trim and glass, and slide up or down until you can make contact with clip. This tool will pull the clip back and let the trim pop loose. Now removing the glass. You need to be very careful. I wear a pair of heavy leather gloves while cutting the glass out. I have a Blue Point brand # YA 109A cutter from Snap On but I'm sure you could find it in another brand. You get it worked under the edge of the glass and pull. I guess fine wire like piano wire will work but have never tried it.
You might also find that one of your glass people does a little work on the side and have them drop by and cut it out for you.
Good Luck and be careful
remove the vacuum line and either 2 nuts or 2 bolts holding it to intake manifold. clean gasket material from mating surfaces and reinstall.
I dont think my vac.secondaries
On the R.H side of the carb behind the automatic choke down on the rear throttle shaft there is a pin running thru the shaft with a lever that will lock it out. If the choke is not fully open or the weight behind the auto choke is not dropping the lever will not relase the secondaries to open.
84 El Camino dashboard lights
not too bat you just unscrew the faceplate that covers the dashes, unbolt the gauge cluster then u can get at them.
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